Simple Sublime Plugin to Add ### Date to a Markdown document

datetimestamp.py

import datetime, getpass
import sublime, sublime_plugin
 
class AddDateStampCommand(sublime_plugin.TextCommand):
	def run(self, edit):
		self.view.run_command("insert_snippet", { "contents": "### %s" % datetime.datetime.now().strftime("%A %m/%d/%Y") } )
 

Default (OSX).sublime-keymap

{ "keys": ["command+alt+1"], "command": "add_date_stamp" }